객관식
Which molecule has a central atom with two single bonds and two lone pairs of electrons, representing an exception to the octet rule in its Lewis dot structure?
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11. Bonding & Molecular Structure
Lewis Dot Structures: Exceptions
객관식
Metalloids can sometimes adopt the bonding preferences of similar nonmetals. Based on your knowledge of expanded octets, draw the Lewis Dot Structure for the following ion, SiF62–.
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검증된 단계별 안내1
Identify the central atom in the ion, which is silicon (Si) in this case.
Determine the total number of valence electrons available. Silicon has 4 valence electrons, and each fluorine atom has 7 valence electrons. Since there are 6 fluorine atoms, the total from fluorine is 6 * 7 = 42. Additionally, the 2- charge indicates 2 extra electrons, making the total 4 + 42 + 2 = 48 valence electrons.
Place the silicon atom in the center and arrange the six fluorine atoms around it. Connect each fluorine atom to the silicon atom with a single bond. Each bond uses 2 electrons, so 6 bonds use 12 electrons, leaving 36 electrons.
Distribute the remaining electrons to satisfy the octet rule for each fluorine atom. Each fluorine needs 8 electrons (including the bonding pair), so place 6 electrons (3 lone pairs) around each fluorine. This uses up all 36 remaining electrons.
Verify the structure by checking that all atoms have a complete octet and that the total number of electrons used matches the number calculated initially. The silicon atom can have an expanded octet, which is satisfied in this structure.
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